Lensless imaging system, method of manufacturing lensless imaging system, and electronic apparatus

Abstract

A lensless imaging system includes a coded mask including at least one domain, and an image sensor configured to receive light that passes through the coded mask and generate an electrical signal for image generation based on the received light, where each of the at least one domain includes a plurality of sub-domains provided in a first pattern, each of the plurality of sub-domains includes a second pattern, and the plurality of sub-domains are configured to deflect incident light based on a combination of the first pattern and the second pattern.

What is claimed is: 
     
         1 . A lensless imaging system comprising:
 a coded mask comprising at least one domain; and   an image sensor configured to:
 receive light that passes through the coded mask; and 
 generate an electrical signal for image generation based on the received light, 
   wherein each of the at least one domain comprises a plurality of sub-domains provided in a first pattern,   wherein each of the plurality of sub-domains comprises a second pattern, and   wherein the plurality of sub-domains are configured to deflect incident light based on a combination of the first pattern and the second pattern.   
     
     
         2 . The lensless imaging system of  claim 1 , wherein the coded mask is configured to change a phase or a transmittance of the incident light. 
     
     
         3 . The lensless imaging system of  claim 1 , wherein the incident light comprises long-wave infrared (LWIR) light. 
     
     
         4 . The lensless imaging system of  claim 1 , wherein the first pattern comprises at least one of a random dot pattern and a curved line pattern. 
     
     
         5 . The lensless imaging system of  claim 1 , wherein the second pattern comprises a meta-blazed grating pattern. 
     
     
         6 . The lensless imaging system of  claim 5 , wherein at least one of a deflection angle of light and a deflection direction of light is varied for each sub-domain of the plurality of sub-domains. 
     
     
         7 . The lensless imaging system of  claim 6 , wherein a magnitude of the deflection angle is proportional to a distance between a center of each sub-domain of the plurality of sub-domains and a center of a domain of the at least one domain to which the each sub-domain of the plurality of sub-domains corresponds. 
     
     
         8 . The lensless imaging system of  claim 6 , wherein the deflection direction is from a center of each sub-domain of the plurality of sub-domains toward a center of a domain of the at least one domain to which the each sub-domain of the plurality of sub-domains corresponds. 
     
     
         9 . The lensless imaging system of  claim 1 , wherein the at least one domain comprises a plurality of domains, and
 wherein each domain of the plurality of domains has an independent point spread function (PSF).   
     
     
         10 . The lensless imaging system of  claim 1 , wherein the coded mask has a planar shape being less than 1 mm in thickness. 
     
     
         11 . The lensless imaging system of  claim 1 , wherein the image sensor comprises at least one of a complementary metal-oxide semiconductor (CMOS) image sensor and a bolometer. 
     
     
         12 . The lensless imaging system of  claim 1 , further comprising a controller comprising a reconstruction algorithm configured to reconstruct an image based on the electrical signal generated by the image sensor. 
     
     
         13 . The lensless imaging system of  claim 12 , wherein the reconstruction algorithm comprises a neural network-based deep learning algorithm. 
     
     
         14 . A method of manufacturing a lensless imaging system, the method comprising:
 forming an image sensor on a substrate; and   forming a coded mask such that the coded mask faces one surface of the image sensor, the coded mask comprising at least one domain,   wherein each of the at least one domain comprises a plurality of sub-domains, and   wherein the forming of the coded mask comprises:
 forming the plurality of sub-domains in a first pattern; and 
 forming a second pattern on each sub-domain of the plurality of sub-domains the respective sub-domains, such that the plurality of sub-domains are configured to deflect incident light based on a combination of the first pattern and the second pattern. 
   
     
     
         15 . The method of  claim 14 , wherein the first pattern comprises at least one of a random dot pattern and a curved line pattern. 
     
     
         16 . The method of  claim 14 , wherein the second pattern comprises a meta-blazed grating pattern. 
     
     
         17 . The method of  claim 16 , wherein the second pattern is formed by varying at least one of a deflection angle of light and a deflection direction of light for each sub-domain of the plurality of sub-domains. 
     
     
         18 . The method of  claim 17 , wherein a magnitude of the deflection angle is proportional to a distance between a center of each sub-domain of the plurality of sub-domains and a center of a domain of the at least one domain to which the each sub-domain of the plurality of sub-domains corresponds. 
     
     
         19 . The method of  claim 17 , wherein the deflection direction is from a center of each sub-domain of the plurality of sub-domains toward a center of a domain of the at least one domain to which the each sub-domain of the plurality of sub-domains corresponds. 
     
     
         20 . An electronic apparatus comprising:
 a lensless imaging system configured to generate an image of a subject; and   a processor configured to control the lensless imaging system,   wherein the lensless imaging system comprises:
 a coded mask comprising at least one domain; and 
 an image sensor configured to:
 receive light that passes through the coded mask; and 
 generate an electrical signal for image generation based on the received light, 
 
   wherein each of the at least one domain comprises a plurality of sub-domains provided in a first pattern,   wherein each of the plurality of sub-domains comprises a second pattern, and   wherein the plurality of sub-domains are configured to deflect incident light based on a combination of the first pattern and the second pattern.